MAINT: fix typing on ndarray.dtype

Author: person142

numpy-stubs/__init__.pyi

@@ -300,7 +300,7 @@ class ndarray(Generic[_ArrayDtype], _ArrayOrScalarCommon, Iterable, Sized, Conta
         order: Optional[str] = ...,
     ) -> ndarray: ...
     @property
-    def dtype(self) -> Type[_ArrayDtype]: ...
+    def dtype(self) -> dtype: ...
     @property
     def ctypes(self) -> _ctypes: ...
     @property

tests/reveal/ndarray_methods.py

@@ -1,4 +1,4 @@
 import numpy as np
 
 nd = np.array([[1, 2], [3, 4]], dtype=np.int64)
-reveal_type(nd.dtype)  # E: numpy.int64
+reveal_type(nd.dtype)  # E: numpy.dtype